POST UTME UNN 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution containing 2.0 M $\text{HCl}$ is mixed with a solution containing 1.0 M $\text{NaOH}$. If 50.0 mL of the $\text{HCl}$ solution is added to 50.0 mL of the $\text{NaOH}$ solution, what is the concentration of the resulting solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 3
A solution of 0.1 M HCl is mixed with a solution of 0.2 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 4
Determine the number of moles of glu\cose (C6H12O6) that can be produced from 2.5 mol of ethene (C2H4) in the following reaction: C2H4 + 3O2 → C2H4O2 + 2CO2. Assume that the reaction proceeds to completion.
A. 1.5 mol
B. 2.0 mol
C. 2.5 mol
D. 3.0 mol
Question 5
A metal rod of length 50 cm and cross-sectional area 2 cm^2 is subjected to a force of 100 N. Calculate the stress and strain on the rod if the Young's modulus of the metal is 2.0 x 10^11 Pa.
A. 2.0 x 10^8 Pa, 0.01
B. 2.0 x 10^8 Pa, 0.01
C. 2.0 x 10^8 Pa, 0.01
D. 2.0 x 10^8 Pa, 0.01
Question 6
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the monomer.
A. 200 g/mol
B. 250 g/mol
C. 300 g/mol
D. 350 g/mol
Question 7
A 0.5 M solution of sodium chloride (NaCl) is prepared by dissolving 25 g of NaCl in 1000 mL of water. Calculate the molarity of the solution if 10 mL of the solution is diluted to 100 mL with water.
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 8
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
A. 1.33
B. 2.00
C. 1.00
D. 0.75
Question 9
The element with atomic number 12 is _______.
A. Mg
B. Ca
C. K
D. Na
Question 10
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1 atm. The vapor pressure of water at this temperature is 0.0313 atm. What is the partial pressure of the gas?
A. 0.9687 atm
B. 0.9697 atm
C. 0.9707 atm
D. 0.9717 atm
Question 11
The s\tandard enthalpy of formation of carbon dioxide (CO2) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of carbon monoxide (CO) if the s\tandard enthalpy of formation of carbon (C) is -717.1 kJ/mol and the s\tandard enthalpy of formation of oxygen (O2) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 12
Determine the number of moles of $\text{O}_2$ required to react with 2.5 moles of $\text{C}_2\text{H}_4$ according to the equation: $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s).
A. -2804 kJ/mol
B. -2864 kJ/mol
C. -2924 kJ/mol
D. -2984 kJ/mol
Question 14
A gas at a pressure of 2 atm and a temperature of 300 K is allowed to expand to twice its original volume. What is the final pressure of the gas?
A. 1 atm
B. 2 atm
C. 4 atm
D. 6 atm
Question 15
A mixture of 0.5 mol of CO2 and 0.3 mol of H2O is placed in a 1 L flask at 25°C. Assuming ideal gas behavior, calculate the partial pressure of CO2 in the mixture.
A. 0.15 atm
B. 0.25 atm
C. 0.35 atm
D. 0.45 atm

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